Researches have shown that the parasitisation percentage of Trichogramma evanescens in kairomone-treated variants is significantly higher than in the control and the comparison variant (alcohol 30%), because the biologically active substance serves as an entomophagous attractant. An important interest is the mode of examination of the interaction - phytophagous and entomophagous as the procedure which stimulates the Trichogramma to find its food sources. The entomophagous reacts to the host's chemicals, the so-called kairomones, which have high potential in regulating harmful insects. In order to carry out research on the behavior of the entomophagous Trichogramma evanescens W., the bean plants were treated with alcohol extract and eggs of cereal moth with kairomone (concentration of 30%), exposure of 5 min. In the variants treated with kairomone, where the action of the fractions extracted from the scales from the cereal moth was appreciated, on the search capacity of T. evanescens, its quality is higher than in the control.